New York, January 5: A New York City subway train derailed on Thursday after colliding with another train at low speed, leaving more than 20 people with minor injuries and causing major service disruptions across Manhattan during the afternoon rush hour, authorities said. At about 3 pm on the Upper West Side, a 1 train carrying about 300 passengers and an out-of-service Metropolitan Transportation Authority train with four workers on board hit each other near the 96th Street station, police and transit officials said at the scene. A "derailment" happens when at least one wheel of a train leaves the track.

The collision knocked out service on the 1, 2 and 3 lines in most of Manhattan, the MTA said. Crews were working on Thursday night to clear the tracks and hoping to get service resumed by Friday morning's commute, but that was not guaranteed, officials said. Photos posted on social media by city emergency management officials showed the passenger train partially off the tracks in an area that had a track-switching mechanism. Officials said there were no immediate signs of equipment failure and investigators were seeing if human error was involved. US: Atleast 24 Injured After Two NYC Subway Trains Collide, Derail

The out-of-service train had become stuck because someone pulled a number of emergency stop cords, said Richard Davey, president of New York City transit for the MTA. "Thankfully, there were no serious injuries," Davey said at a news conference. "Obviously, two trains should not be bumping into one another. We are going to get to the bottom of that." The aging New York subway system has struggled in recent years with power outages, signal problems and other breakdowns. US Bomb Blast Threat: Bomb Threats Prompt Evacuations of Government Buildings in Several States, No Explosives Found

Firefighters helped remove passengers from the in-service train as well as a few hundred more people from another train that was not involved but had to stop in the tunnel because of the collision. The NYPD said seven passengers and one crew member were taken to hospitals. At least 20 emergency vehicles were on the scene, including police, fire and MTA responders.

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